My experience with glass is limited, so I could be wrong, but I would imagine that any glass toy on here for the most part would be able to do both, provided that you weren't microwaving or going from one extreme temperature to another right away.

Temperature play is a relative term - you shouldn't be looking at anything too hot or cold. Anything that is bearable for your intimate parts would not be a problem for the glass toys that I have - and I do own a Lucid Heart.

Another thing to avoid is large temperature swings - don't take hot glass an put cold water on it - or vice-versa.

Temperature play is a relative term - you shouldn't be looking at anything too hot or cold. Anything that is bearable for your intimate parts would not be a problem for the glass toys that I have - and I do own a Lucid Heart.

Another thing
...

Temperature play is a relative term - you shouldn't be looking at anything too hot or cold. Anything that is bearable for your intimate parts would not be a problem for the glass toys that I have - and I do own a Lucid Heart.

Another thing to avoid is large temperature swings - don't take hot glass an put cold water on it - or vice-versa.

Moderation is a good thing!

Very true, and I will add to be careful with how hot, test on the inside of your arm or mouth for that matter, your hand can take more heat than your inner tissue.

I use the Amber Wave for my temperature play. I tend to put it in the freezer for a minute or two, that way it isn't too cold, but is still delightful. I don't think I'd ever want my glass to be hot. =/

Temperature play is a relative term - you shouldn't be looking at anything too hot or cold. Anything that is bearable for your intimate parts would not be a problem for the glass toys that I have - and I do own a Lucid Heart.

Another thing
...

Temperature play is a relative term - you shouldn't be looking at anything too hot or cold. Anything that is bearable for your intimate parts would not be a problem for the glass toys that I have - and I do own a Lucid Heart.

Another thing to avoid is large temperature swings - don't take hot glass an put cold water on it - or vice-versa.